Telecommunications – Transmitter and receiver at separate stations
Patent
1994-04-28
1997-04-29
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
455 59, 455 65, 455103, 455343, H04B 702
Patent
active
056258810
ABSTRACT:
The invention provides a means by which a radio system in a multipath propagation environment may improve the probability of successful reception of a message by the application of diversity. It is applicable to such applications as paging, cordless telephones, cellular telephones, and radio identification tags. The transmitter sends the message repeatedly, each repetition transmitted from a different antenna. The antennas are separated so that multipath fading of the signal arriving at the receiver from each transmit antenna is substantially uncorrelated with the multipath fading of the signal arriving at the receiver from the other transmit antennas. The receiver examines the radio channel for an incoming message for a time period long enough for it to potentially receive the message from each antenna. Even if the message sent from one antenna is faded such that it cannot be received successfully at the portable receiver, the likelihood is that the message will be successfully received when it is transmitted from another antenna.
REFERENCES:
patent: 3665395 (1972-05-01), Bochmann
patent: 4964121 (1990-10-01), Moore
patent: 5095535 (1992-03-01), Freeburg
patent: 5203018 (1993-04-01), Hirose
patent: 5280631 (1994-01-01), Nakahi et al.
patent: 5305353 (1994-04-01), Weerackody
patent: 5437055 (1995-07-01), Wheatley, III
Parsons, "Field-Diversity Antenna For U.H.F. Mobile Radio", Electronics Letters, vol. 10, No. 7, pp. 91-92, (1974).
Connors, "Error Controlled Diversity Combiner", IBM Technical Disclosure Bulletin, vol. 7, No. 5, pp.371, (1964).
Wu et al., "An Error Control Scheme with Two Frequency Hopping and Half Rate Code for Indoor Radio Systems", 16th Bi-ennial Symposium on Communications at Queens' University, Ontario, Canada, pp. 13-16.
Altekar Shirish A.
Sandler Howard M.
Strawczynski Leo
Bell-Northern Research Ltd.
Eisenzopf Reinhard J.
Sobutka Philip J.
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